[Notifier] [Slack] Add button block element and `emoji`/`verbatim` options to section block

by @cvergne

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Review the proposed patch then download it to apply it manually or execute the following command from the repository root directory:

curl https://fabbot.io/patch/symfony/symfony/54737/5d4302b3f70030fb18d925c223a000dc3cfb90d6/cs.diff | patch -p0
diff -ru src/Symfony/Component/Notifier/Bridge/Slack/Tests/SlackOptionsTest.php src/Symfony/Component/Notifier/Bridge/Slack/Tests/SlackOptionsTest.php
--- src/Symfony/Component/Notifier/Bridge/Slack/Tests/SlackOptionsTest.php	2024-04-26 07:58:27.534029348 +0000
+++ src/Symfony/Component/Notifier/Bridge/Slack/Tests/SlackOptionsTest.php	2024-04-26 07:58:30.680140138 +0000
@@ -90,8 +90,6 @@
 
     /**
      * @dataProvider setProvider
-     *
-     * @param mixed $value
      */
     public function testSet(string $method, string $optionsKey, $value)
     {

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